Sr-Nd-Pb-Ca Isotopes of Holocene Basalts from Jingpohu, NE China: Implications for the Origin of Their Enriched Mantle Signatures

The geochemistry on Holocene lavas from the Jingpohu volcanic field in NE China are compared with other Cenozoic across back-arc rift of China, order to constrain their enriched mantle sources. within comprise two separate “Crater Forest” (CF) and “Frog Pool” (FP) areas. FP have lower MgO, CaO, heavy rare earth elements higher Al2O3, Na2O, K2O, large-ion lithophile than CF lavas. Yet, both share similar isotopic signatures, depleted Sr Nd isotopes (87Sr/86Sr = 0.703915–0.704556, 143Nd/144Nd 0.512656–0.512849) unradiogenic Pb (208Pb/204Pb 37.79–38.06, 207Pb/204Pb 15.45–15.54, 206Pb/204Pb 17.49–18.15), oceanic island basalts. An important new constraint for lies Ca δ44/40Ca 0.63‰ 0.77‰, which that bulk silicate (0.94 ± 0.05‰). By comparing signatures sodic potassic we propose a three-component mixing model as source In consistence geophysical results, subducting Pacific plate induces asthenospheric upwelling an upper (DM), including subducted ancient sediments (EM I), partially melted upon ascent. These primary melts further interacted lithospheric II), before differentiating crustal magma chambers erupting.